>> "Each PostgreSQL table has a, system assigned, oid
>> (object ID) column which is useful for uniquely
>> identifying rows. Users have vertually no control
>> over it value."
> Check out the following manual page:
> in particular the AUTO_INCREMENT attribute.
AUTO_INCREMENT is not unique. it just takes max(auto_inc_field)
and adds one. there's nothing that prevents reusing the same
values in case you delete something from the end of the table.
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